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Detecting Water Depth from Remotely Sensed Imagery Based on ELM and GA-ELM

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Abstract

The shallow seawater depth inversion based on remote sensing technology is important for water depth detection, which is of considerable significance to marine engineering, shipping, and marine military security. In this study, we took the Taiping Island and its adjacent waters in the South China Sea as a test bed and developed a water depth inversion model on the basis of extreme learning machine (ELM) and extreme learning machine optimized by genetic algorithm (GA-ELM). In GA-ELM, the input weights and the hidden layer biases were optimized by genetic algorithm. The two models allowed the evaluation of nonlinear relationships between the reflectance of high-resolution imagery from WorldView-2 and actual water depth obtained from the S-57 sea chart. The eight bands of the high-resolution image and the actual water depth were used as the input layer and the output layer, and the sigmoid function was introduced as activation function. Finally, the model accuracy was evaluated by using mean relative error (MRE), root mean square error (RMSE), mean absolute error (MAE), coefficient of determination (R2), and the regression analysis between the retrieved water depth and the actual data. The simulation results showed that the two models had better stability than the second-order polynomial regression, BP neural network, and RBF neural network. Furthermore, GA-ELM had a more compact network structure and better generalization ability than ELM. Thus, we concluded that GA-ELM had higher precision and could achieve a better inversion result in the experimental area.

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Authors and Affiliations

  1. School of Geography and Information Engineering, China University of Geosciences, Wuhan, China

    Guizhou Zheng, Weihua Hua & Zimei Gong

  2. School of Resource and Environmental Sciences, Wuhan University, Wuhan, China

    Zhonghang Qiu

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  1. Guizhou Zheng
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  2. Weihua Hua
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  3. Zhonghang Qiu
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  4. Zimei Gong
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Correspondence to Guizhou Zheng.

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Zheng, G., Hua, W., Qiu, Z. et al. Detecting Water Depth from Remotely Sensed Imagery Based on ELM and GA-ELM. J Indian Soc Remote Sens 49, 947–957 (2021). https://doi.org/10.1007/s12524-020-01270-w

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  • DOI: https://doi.org/10.1007/s12524-020-01270-w

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